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Unit: Chemical Reactions

In this unit, we explore diatomic elements and the process of translating word equations into formula equations. By the end of the lesson, you will be able to identify diatomic elements, write balanced formula equations from provided word equations, and understand the concept of reactants and products in chemical reactions. Key elements include recognizing common chemical reaction types, writing correct symbols for compounds, and balancing chemical equations. Engage in practice problems to solidify your understanding before moving on to homework assignments.

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Unit: Chemical Reactions

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  1. Day 1 - Notes Unit: Chemical Reactions Diatomic elements, Writing formula equations from word equations

  2. After today you will be able to… • Name the diatomic elements • Write formula equations given the word equation for a chemical reaction heat Pt

  3. A chemical equation represents a chemical reaction. ReactantsProducts “Yield” • Reactants and products are separated from each other with a plus (+)sign.

  4. Common forms of chemical reactions… A + B  C A  B + C A + B  C + D

  5. Chemical equations can be written as word equations or formula equations. Formula equations can be balanced or unbalanced.

  6. Word Equation: Iron + Oxygen  Iron (III) Oxide Formula Equation: 4Fe(s) + 3O2(g)  2Fe2O3(s) Balanced!

  7. Symbols in Chemical Equations heat Pt

  8. To change word equations into formula equations follow the flow chart…

  9. Just write the symbol • Example: • “Sodium”=Na • Br2 I2 N2 Cl2 H2 O2 F2 • Have the subscript “2” • Examples: • “Bromine”=Br2 • “Hydrogen” = H2

  10. (nM +nM) (M +nM) • Prefixes for subscripts • Examples: • “dinitrogen tetraoxide” • Balance charges!!! • Example: “calcium chloride” • Ca+2 Cl-1 • Cl-1 N2O4 CaCl2

  11. Let’s try some examples! 

  12. Na+1 Cl-1 Na+1 F-1 + F2  NaF + Cl2 NaCl Examples: Convert into formula equations… 1. sodium chloride + fluorine  sodium fluoride + chlorine 2. aluminum + sulfur  aluminum sulfide Helpful tip: Keep all substances and + signs in line with each other! Al+3 S-2 + S  Al Al2S3

  13. Zn+2 S-2 Mg+2 (AsO4)-3 Mg+2 S-2 Zn+2 (AsO4)-3 3. zinc + magnesium  zinc + magnesium sulfide arsenate arsenate sulfide + Mg3(AsO4)2 Zn3(AsO4)2 +  MgS ZnS

  14. Do now: Complete “Exit Ticket” Then: Begin WS 1 (Homework)

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